Do you need pressure treated wood for roofing?

Pressure-treated lumber is one of the best options that you can use for a roof deck because of its extreme durability. If you are constructing a roof deck, you will need to be concerned with the amount of water that gets on the wood. … Furthermore, this type of wood is not susceptible to insect damage or rot.

Do I need pressure treated plywood for roof?

Is Roof Decking Treated? … Contractors generally recommend treated plywood rather than regular plywood for roof decking because condensation can build up on the sheathing and cause rot. Roofers understand that when it comes to the roof deck, the amount of water that gets on the wood is a concern.

Do roof timbers need to be treated?

The simple truth is that you do NOT need to treat timber. … The same goes for actual rot by fungus – timber is simply NOT going to rot if it is kept dry.

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What type of wood do you use for roofing?

The most common materials for this are oriented strand board (OSB) or plywood, both formed of layers of wood bonded into a panel. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors.

Should rafters be pressure treated?

Use pressure treated wood in any situation where there’s direct contact between the wood and anything that could supply moisture. … As long as there’s a good chance that moisture can reach the wood, it should be pressure treated.

What is the best material for roof sheathing?

OSB is now the most-used sheathing and subflooring material for new roofs and roof replacements. OSB is currently selling for less than plywood by approximately $3 per sheet, meaning a savings of several hundred dollars per conventional home.

What kind of plywood is used for roof decking?

OSB is made of interwoven strands of wood bonded with adhesive. Plywood – Half-inch construction-grade plywood is another common building material used for roof decking. The installation methods are the same as OSB, including the standard spacing required for thermal expansion and contraction.

What is the difference between C16 and C24 timber?

Whilst C16 graded timber is strong enough for some applications such as wall plates, studwork, rafters, joists etc… C24 comes with added benefits. C24 timber has been graded to a higher standard than C16. It’s a premium piece of timber that can handle higher loads and wider spans.

Do I need treated timber in loft?

5 Answers from MyBuilder Roofers. Hi, no you do not have to treat for something that doesn’t exist. Breathable felt and correct installation of the roof insulation will allow the timbers to stay dry and free from future rot.

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Can I use 3×2 for roof?

noseall. The normal rafter size is 3×2″ if you do not intend to use it as living space treat all the roof timber and you want some wall plate straps, they look like long L shape with lots of holes in and spaced every 1.5 m if memory serves me.

Is 7/16 OSB OK for roofing?

…or a non-laminated panel, such as this OSB. Either one is acceptable. The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch. … If you find 3/8-inch plywood installed as roof sheathing, it’s a good idea to make your client aware of its presence.

What size wood do you use for rafters?

Max. Live Load 20 lbs/ft2 (956 N/m2)

Maximum Span (ft – in)
Nominal Size (inches) Rafter Spacing, Center to Center, OC (inches) Lumber Grade
2 x 10 16 25′
24 20′ – 9”
2 x 12 12 33′ – 6”

Can I use pressure treated wood for roof rafters?

As long as the rafters are not directly exposed to the elements, no need to be treated. … Treated is generally for ground contact or exposed to the elements or high humidity areas.

What is the best wood to use for rafters?

Kiln-dried Douglas fir wood presents the number one choice for building a rafter-styled roof in a wood frame house. This tree grows prodigiously in the Pacific Northwest. Since it is readily harvested in substantial quantities, the price is reasonable.

Can you use pressure-treated wood for wall studs?

The simple answer is pressure-treated lumber can be used in any interior application except cutting boards and countertops. Some have also asked, after they’ve found pressure-treated lumber installed inside their homes, if there is any danger in having it indoors. The answer is no.

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Should pressure-treated wood be used for patio covers?

Pressure-treated pine, the most affordable option, is rot and insect resistant. However, a preservative will need to be applied after construction to slow the process of weathering. Pressure-treated pine can be stained nearly any color you like. Another type of wood that can be used to build a patio cover is cedar.

Roofs and roofing